2011-09-25  Paolo Carlini  <paolo.carlini@oracle.com>

	Revert (no longer necessary post r179130):

	2010-04-27  Fabien Chêne  <fabien.chene@gmail.com>

	* testsuite/util/testsuite_error.h: Add empty default constructor
	to __gnu_test::test_category and
	__gnu_test::test_derived_category.
	* src/future.cc: Add empty default constructor to
	future_error_category.
	* src/system_error.cc: Add default ctor to generic_error_category
	and system_error_category.

From-SVN: r179172